Publication Details

This paper originally appeared as: Mendis, R, Sydlo, C and Sigmund, J et al, Spectral characterization of broadband THz antennas by photoconductive mixing: toward optimal antenna design, Antennas and Wireless Propagation Letters, 2005, vol 4, 85-88. Copyright IEEE 2005.


The spectral characterization of a broadband antenna using a pump-probe photomixing continuous-wave (CW) terahertz (THz) system is presented. The high dynamic range of the system, comparable to or better than that of similar pump-probe systems reported in the literature, provides an accurate means of antenna characterization. The planar antenna exhibits a log-periodic behavior at low frequencies, a bow-tie behavior at high frequencies, and a resonance characteristic in between, well in agreement with the antenna geometry. It is predicted that an improved geometry that extends the log-periodic behavior to higher frequencies would contribute significantly in enhancing the broadband performance of antenna-coupled photomixers.

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